Well, 'Fallen Hope' is one that stands out. It explores Deku's descent into villainy in a very compelling way, with lots of plot twists and character development.
One common theme is the corruption of the hero system. These fanfics often show Deku turning into a villain because he sees the flaws in how heroes operate. Another theme is the exploration of good and evil. It makes readers think about whether Deku is truly evil or if he has valid reasons for his actions.
One idea could be that Deku, turned villain, challenges Bakugou's view of heroism. He could expose the flaws in the hero society that Bakugou blindly believes in. For example, Deku might target the way heroes are ranked and how it creates a cut - throat environment. This would force Bakugou to re - evaluate his own pursuit of being the top hero.
Sure. One popular 'boku no hero academia villain deku fanfic' is 'The Fall of a Hero'. It shows an interesting take on Deku turning into a villain, exploring his motives and the reactions of the other characters. Another one could be 'Deku's Dark Descent' which delves deep into his transformation process and how it affects the hero society.